	<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>z-index</title>
	<style>
		.sample0, .sample1{position: absolute;width: 200px;line-height: 150px;text-align: center;}
		.sample0{background-color: #ff0;}
		.sample1{background-color: pink;}

		.sample1{top: 100px;left: 100px;}
			
		/*.sample0{z-index: 9;}*/

		/*.container0, .container1{position: relative;}*/
		/*.container1{z-index: 99;}*/
	</style>
</head>
<body>
	<div class="container0"><div class="sample0">sample 0</div></div>
	<div class="container1"><div class="sample1">sample 1</div></div>
</body>
</html>